Corylus colurna
Common name: 
Turkish Hazel
KO-ril-us ko-LURN-a
Native to (or naturalized in) Oregon: 
  • Broadleaf deciduous tree, 35-50(80) ft [11-15(24) m] tall, slow growing, broad pyramidal symmetrical shape, horizontal limbs small, usually with a short trunk and bark which is pale brown, flaky.  Leaves alternate, simple, ovate to obovate, 6-15 cm long, acuminate tip, base cordate, margin serrate or crenate-serrate, dark green, pubescence on veins below; fall color pale yellow/green, sometimes purplish.  Flowers; male catkins 5-8 cm long, female flowers small, inconspicuous.  Fruit a nut, clustered, involucre about 4-5 cm wide, deeply divided into linear lobes, nut 12-16 mm across.
  • Sun to light shad, best in well-drained soil.  Considered a possibility for "difficult sites", tolerates drought and alkaline soil.  Received the Royal Horticultural Society's Award of Garden Merit in 1993.
  • Hardy to USDA Zone 4      Native to southeast Europe and western Asia.
  • colurna: classical name


Click image to enlarge
  • plant habit, winter, male catkins

    plant habit, winter, male catkins

  • winter, male catkins

    winter, male catkins

  • flowers, male and female

    flowers, male and female

  • plant habit, late spring

    plant habit, late spring

  • leaf


  • leaf


  • ripening fruit

    ripening fruit

  • leaves and fruit

    leaves and fruit

  • mature fruit (nut)

    mature fruit (nut)

  • trunk, bark

    trunk, bark

  • winter twigs, buds

    winter twigs, buds